M&S says

Don’t let sudden showers bring you down. This modern bomber jacket is treated with water-resistant Stormwear™ technology, keeping you dry in soggy surroundings. Featuring sporty ribbed trim at the cuffs and hemline, our men’s bomber jacket is cut in a regular fit for a loose, comfortable fit. Its laid-back styling makes it a natural topper to wear over casual outfits ranging from jeans to summery shorts. Inside, you’ll find contrasting lining as well as clever interior pockets to store valuables out of sight.